diff --git a/components/fpspreadsheet/fpsopendocument.pas b/components/fpspreadsheet/fpsopendocument.pas
index c23433fcf..0906a0c95 100755
--- a/components/fpspreadsheet/fpsopendocument.pas
+++ b/components/fpspreadsheet/fpsopendocument.pas
@@ -910,7 +910,7 @@ begin
           nf := nfGeneral
         else begin
           decs := StrToInt(s);
-          grouping := GetAttrValue(node, 'grouping') = 'true';
+          grouping := GetAttrValue(node, 'number:grouping') = 'true';
           nf := IfThen(grouping, nfFixedTh, nfFixed);
         end;
         fmt := BuildNumberFormatString(nf, Workbook.FormatSettings, decs);